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Note Employee benefits (Plans target allocation by asset category) (Detail) | Dec. 31, 2018 | Dec. 31, 2017
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Popular Related Securities |  |
Defined Benefit Plan Disclosure |  |
Define benefit plan actual asset allocations | 1.00% |
Popular Related Securities | Maximum |  |
Defined Benefit Plan Disclosure |  |
Defined benefit plan assets target allocation | 5.00% |
Popular Related Securities | Minimum |  |
Defined Benefit Plan Disclosure |  |
Defined benefit plan assets target allocation | 0.00% |
Equity |  |
Defined Benefit Plan Disclosure |  |
Define benefit plan actual asset allocations | 32.00% | 40.00%
Equity | Maximum |  |
Defined Benefit Plan Disclosure |  |
Defined benefit plan assets target allocation | 70.00% |
Equity | Minimum |  |
Defined Benefit Plan Disclosure |  |
Defined benefit plan assets target allocation | 0.00% |
Debt Securities |  |
Defined Benefit Plan Disclosure |  |
Define benefit plan actual asset allocations | 65.00% | 57.00%
Debt Securities | Maximum |  |
Defined Benefit Plan Disclosure |  |
Defined benefit plan assets target allocation | 100.00% |
Debt Securities | Minimum |  |
Defined Benefit Plan Disclosure |  |
Defined benefit plan assets target allocation | 0.00% |
Cash and Cash Equivalents |  |
Defined Benefit Plan Disclosure |  |
Define benefit plan actual asset allocations | 2.00% | 3.00%
Cash and Cash Equivalents | Maximum |  |
Defined Benefit Plan Disclosure |  |
Defined benefit plan assets target allocation | 100.00% |
Cash and Cash Equivalents | Minimum |  |
Defined Benefit Plan Disclosure |  |
Defined benefit plan assets target allocation | 0.00% |

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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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